<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>商家后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button></el-header
    >
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!--一级菜单-->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!--一级菜单模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item
              :index="'/' + subItem.path + ''"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path )"
            >
              <!--二级菜单模板区域-->
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--左侧内容主体-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      //左侧菜单数据
      menulist: [],
      iconsObj: {
        125: "iconfont icon-user",
        103: "iconfont icon-tijikongjian",
        101: "iconfont icon-shangpin",
        102: "iconfont icon-danju",
        145: "iconfont icon-baobiao",
      },
    //是否折叠
    isCollapse: false,
    //被激活的链接地址
    activePath: ''
    };
  },
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    //退出登录
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    //获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menulist = res.data;
      console.log(res);
    },
    //点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }
  },
};
</script>

<style scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0px;
  align-items: center;
  color: #fff;
  font-size: 25px;
}
.el-header > div {
  display: flex;
  align-items: center;
}
.el-header > div span {
  margin-left: 20px;
}
.el-aside {
  background-color: #333744;
}
.el-aside .el-menu {
  border-right: none;
}
.el-main {
  background-color: #eaedf1;
}
.home-container {
  height: 100%;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
